Restock Monitor for Shoe Sites -- 3

I am looking to create a script that runs 24/7 that can catch as soon as possible when stock is loaded onto a website, when a product page is available, and automatically, with the most minimal delay possible, send that information (The Item Loaded and the corresponding link) to to my discord channel. I would also love for it to be configurable so that I am able to add in additional sites. I would also love to be able to filter what gets shown on the Discord Channel (keywords possibly) as I don't want to get spammed with an obnoxious amount of information from stock loading on the 50+ websites I would like to track. This information is very pertinent to users that resell sneakers and they need the most up-to-date information about a site loading stock on the backend that is available on the front end, or just having an early link to purchase from before everyone else. This information is also super useful when a site is sold out and products restock a few hours or even days/weeks later. Users with this information usually are able to purchase without the public knowing about the restock. I prefer it to be in Javascript as I can maintain and configure myself. Appreciate you taking a look